/*
 * ceph_fs.h - Ceph constants and data types to share between kernel and
 * user space.
 *
 * Most types in this file are defined as little-endian, and are
 * primarily intended to describe data structures that pass over the
 * wire or that are stored on disk.
 *
 * LGPL-2.1 or LGPL-3.0
 */

#ifndef CEPH_FS_H
#define CEPH_FS_H

#include "msgr.h"
#include "rados.h"

/*
 * The data structures defined here are shared between Linux kernel and
 * user space.  Also, those data structures are maintained always in
 * little-endian byte order, even on big-endian systems.  This is handled
 * differently in kernel vs. user space.  For use as kernel headers, the
 * little-endian fields need to use the __le16/__le32/__le64 types.  These
 * are markers that indicate endian conversion routines must be used
 * whenever such fields are accessed, which can be verified by checker
 * tools like "sparse".  For use as user-space headers, the little-endian
 * fields instead use types ceph_le16/ceph_le32/ceph_le64, which are C++
 * classes that implement automatic endian conversion on every access.
 * To still allow for header sharing, this file uses the __le types, but
 * redefines those to the ceph_ types when compiled in user space.
 */
#ifndef __KERNEL__
#include "byteorder.h"
#define __le16 ceph_le16
#define __le32 ceph_le32
#define __le64 ceph_le64
#endif

/*
 * subprotocol versions.  when specific messages types or high-level
 * protocols change, bump the affected components.  we keep rev
 * internal cluster protocols separately from the public,
 * client-facing protocol.
 */
#define CEPH_OSDC_PROTOCOL 24 /* server/client */
#define CEPH_MDSC_PROTOCOL 32 /* server/client */
#define CEPH_MONC_PROTOCOL 15 /* server/client */

#define CEPH_INO_ROOT 1
#define CEPH_INO_CEPH 2			  /* hidden .ceph dir */
#define CEPH_INO_LOST_AND_FOUND 4 /* reserved ino for use in recovery */

/* arbitrary limit on max # of monitors (cluster of 3 is typical) */
#define CEPH_MAX_MON 31

/*
 * ceph_file_layout - describe data layout for a file/inode
 */
struct ceph_file_layout
{
	/* file -> object mapping */
	__le32 fl_stripe_unit;	/* stripe unit, in bytes.  must be multiple
				      of page size. */
	__le32 fl_stripe_count; /* over this many objects */
	__le32 fl_object_size;	/* until objects are this big, then move to
				      new objects */
	__le32 fl_cas_hash;		/* UNUSED.  0 = none; 1 = sha256 */

	/* pg -> disk layout */
	__le32 fl_object_stripe_unit; /* UNUSED.  for per-object parity, if any */

	/* object -> pg layout */
	__le32 fl_unused;  /* unused; used to be preferred primary for pg (-1 for none) */
	__le32 fl_pg_pool; /* namespace, crush ruleset, rep level */
} __attribute__((packed));

#define CEPH_MIN_STRIPE_UNIT 65536

struct ceph_dir_layout
{
	__u8 dl_dir_hash; /* see ceph_hash.h for ids */
	__u8 dl_unused1;
	__u16 dl_unused2;
	__u32 dl_unused3;
} __attribute__((packed));

/* crypto algorithms */
#define CEPH_CRYPTO_NONE 0x0
#define CEPH_CRYPTO_AES 0x1

#define CEPH_AES_IV "cephsageyudagreg"

/* security/authentication protocols */
#define CEPH_AUTH_UNKNOWN 0x0
#define CEPH_AUTH_NONE 0x1
#define CEPH_AUTH_CEPHX 0x2

/* msgr2 protocol modes */
#define CEPH_CON_MODE_UNKNOWN 0x0
#define CEPH_CON_MODE_CRC 0x1
#define CEPH_CON_MODE_SECURE 0x2

extern const char *ceph_con_mode_name(int con_mode);

/*  For options with "_", like: GSS_GSS
    which means: Mode/Protocol to validate "authentication_authorization",
    where:
      - Authentication: Verifying the identity of an entity.
      - Authorization:  Verifying that an authenticated entity has
                        the right to access a particular resource.
*/
#define CEPH_AUTH_GSS 0x4
#define CEPH_AUTH_GSS_GSS CEPH_AUTH_GSS

#define CEPH_AUTH_UID_DEFAULT ((__u64)-1)

/*********************************************
 * message layer
 */

/*
 * message types
 */

/* misc */
#define CEPH_MSG_SHUTDOWN 1
#define CEPH_MSG_PING 2

/* client <-> monitor */
#define CEPH_MSG_MON_MAP 4
#define CEPH_MSG_MON_GET_MAP 5
#define CEPH_MSG_MON_GET_OSDMAP 6
#define CEPH_MSG_MON_METADATA 7
#define CEPH_MSG_STATFS 13
#define CEPH_MSG_STATFS_REPLY 14
#define CEPH_MSG_MON_SUBSCRIBE 15
#define CEPH_MSG_MON_SUBSCRIBE_ACK 16
#define CEPH_MSG_AUTH 17
#define CEPH_MSG_AUTH_REPLY 18
#define CEPH_MSG_MON_GET_VERSION 19
#define CEPH_MSG_MON_GET_VERSION_REPLY 20

/* client <-> mds */
#define CEPH_MSG_MDS_MAP 21

#define CEPH_MSG_CLIENT_SESSION 22
#define CEPH_MSG_CLIENT_RECONNECT 23

#define CEPH_MSG_CLIENT_REQUEST 24
#define CEPH_MSG_CLIENT_REQUEST_FORWARD 25
#define CEPH_MSG_CLIENT_REPLY 26
#define CEPH_MSG_CLIENT_RECLAIM 27
#define CEPH_MSG_CLIENT_RECLAIM_REPLY 28
#define CEPH_MSG_CLIENT_METRICS 29
#define CEPH_MSG_CLIENT_CAPS 0x310
#define CEPH_MSG_CLIENT_LEASE 0x311
#define CEPH_MSG_CLIENT_SNAP 0x312
#define CEPH_MSG_CLIENT_CAPRELEASE 0x313
#define CEPH_MSG_CLIENT_QUOTA 0x314

/* pool ops */
#define CEPH_MSG_POOLOP_REPLY 48
#define CEPH_MSG_POOLOP 49

/* osd */
#define CEPH_MSG_OSD_MAP 41
#define CEPH_MSG_OSD_OP 42
#define CEPH_MSG_OSD_OPREPLY 43
#define CEPH_MSG_WATCH_NOTIFY 44
#define CEPH_MSG_OSD_BACKOFF 61

/* FSMap subscribers (see all MDS clusters at once) */
#define CEPH_MSG_FS_MAP 45
/* FSMapUser subscribers (get MDS clusters name->ID mapping) */
#define CEPH_MSG_FS_MAP_USER 103

/* watch-notify operations */
enum
{
	CEPH_WATCH_EVENT_NOTIFY = 1,		  /* notifying watcher */
	CEPH_WATCH_EVENT_NOTIFY_COMPLETE = 2, /* notifier notified when done */
	CEPH_WATCH_EVENT_DISCONNECT = 3,	  /* we were disconnected */
};

const char *ceph_watch_event_name(int o);

/* pool operations */
enum
{
	POOL_OP_CREATE = 0x01,
	POOL_OP_DELETE = 0x02,
	POOL_OP_AUID_CHANGE = 0x03,
	POOL_OP_CREATE_SNAP = 0x11,
	POOL_OP_DELETE_SNAP = 0x12,
	POOL_OP_CREATE_UNMANAGED_SNAP = 0x21,
	POOL_OP_DELETE_UNMANAGED_SNAP = 0x22,
};

struct ceph_mon_request_header
{
	__le64 have_version;
	__le16 session_mon;
	__le64 session_mon_tid;
} __attribute__((packed));

struct ceph_mon_statfs
{
	struct ceph_mon_request_header monhdr;
	struct ceph_fsid fsid;
} __attribute__((packed));

struct ceph_statfs
{
	__le64 kb, kb_used, kb_avail;
	__le64 num_objects;
} __attribute__((packed));

struct ceph_mon_statfs_reply
{
	struct ceph_fsid fsid;
	__le64 version;
	struct ceph_statfs st;
} __attribute__((packed));

const char *ceph_pool_op_name(int op);

struct ceph_mon_poolop
{
	struct ceph_mon_request_header monhdr;
	struct ceph_fsid fsid;
	__le32 pool;
	__le32 op;
	__le64 __old_auid; // obsolete
	__le64 snapid;
	__le32 name_len;
} __attribute__((packed));

struct ceph_mon_poolop_reply
{
	struct ceph_mon_request_header monhdr;
	struct ceph_fsid fsid;
	__le32 reply_code;
	__le32 epoch;
	char has_data;
	char data[0];
} __attribute__((packed));

struct ceph_mon_unmanaged_snap
{
	__le64 snapid;
} __attribute__((packed));

struct ceph_osd_getmap
{
	struct ceph_mon_request_header monhdr;
	struct ceph_fsid fsid;
	__le32 start;
} __attribute__((packed));

struct ceph_mds_getmap
{
	struct ceph_mon_request_header monhdr;
	struct ceph_fsid fsid;
} __attribute__((packed));

struct ceph_client_mount
{
	struct ceph_mon_request_header monhdr;
} __attribute__((packed));

#define CEPH_SUBSCRIBE_ONETIME 1 /* i want only 1 update after have */

struct ceph_mon_subscribe_item
{
	__le64 start;
	__u8 flags;
} __attribute__((packed));

struct ceph_mon_subscribe_ack
{
	__le32 duration; /* seconds */
	struct ceph_fsid fsid;
} __attribute__((packed));

/*
 * mdsmap flags
 */
#define CEPH_MDSMAP_NOT_JOINABLE (1 << 0)			/* standbys cannot join */
#define CEPH_MDSMAP_DOWN (CEPH_MDSMAP_NOT_JOINABLE) /* backwards compat */
#define CEPH_MDSMAP_ALLOW_SNAPS (1 << 1)			/* cluster allowed to create snapshots */
/* deprecated #define CEPH_MDSMAP_ALLOW_MULTIMDS (1<<2) cluster allowed to have >1 active MDS */
/* deprecated #define CEPH_MDSMAP_ALLOW_DIRFRAGS (1<<3) cluster allowed to fragment directories */
#define CEPH_MDSMAP_ALLOW_MULTIMDS_SNAPS (1 << 4) /* cluster alllowed to enable MULTIMDS \
													 and SNAPS at the same time */
#define CEPH_MDSMAP_ALLOW_STANDBY_REPLAY (1 << 5) /* cluster alllowed to enable MULTIMDS */

#define CEPH_MDSMAP_DEFAULTS (CEPH_MDSMAP_ALLOW_SNAPS | \
							  CEPH_MDSMAP_ALLOW_MULTIMDS_SNAPS)

/*
 * mds states
 *   > 0 -> in
 *  <= 0 -> out
 */
#define CEPH_MDS_STATE_DNE 0			 /* down, does not exist. */
#define CEPH_MDS_STATE_STOPPED -1		 /* down, once existed, but no subtrees. \
						empty log. */
#define CEPH_MDS_STATE_BOOT -4			 /* up, boot announcement. */
#define CEPH_MDS_STATE_STANDBY -5		 /* up, idle.  waiting for assignment. */
#define CEPH_MDS_STATE_CREATING -6		 /* up, creating MDS instance. */
#define CEPH_MDS_STATE_STARTING -7		 /* up, starting previously stopped mds */
#define CEPH_MDS_STATE_STANDBY_REPLAY -8 /* up, tailing active node's journal */
#define CEPH_MDS_STATE_REPLAYONCE -9	 /* Legacy, unused */
#define CEPH_MDS_STATE_NULL -10

#define CEPH_MDS_STATE_REPLAY 8		   /* up, replaying journal. */
#define CEPH_MDS_STATE_RESOLVE 9	   /* up, disambiguating distributed \
					  operations (import, rename, etc.) */
#define CEPH_MDS_STATE_RECONNECT 10	   /* up, reconnect to clients */
#define CEPH_MDS_STATE_REJOIN 11	   /* up, rejoining distributed cache */
#define CEPH_MDS_STATE_CLIENTREPLAY 12 /* up, replaying client operations */
#define CEPH_MDS_STATE_ACTIVE 13	   /* up, active */
#define CEPH_MDS_STATE_STOPPING 14	   /* up, but exporting metadata */
#define CEPH_MDS_STATE_DAMAGED 15	   /* rank not replayable, need repair */

extern const char *ceph_mds_state_name(int s);

/*
 * metadata lock types.
 *  - these are bitmasks.. we can compose them
 *  - they also define the lock ordering by the MDS
 *  - a few of these are internal to the mds
 */
#define CEPH_LOCK_DN (1 << 0)
#define CEPH_LOCK_DVERSION (1 << 1)
#define CEPH_LOCK_ISNAP (1 << 4)   /* snapshot lock. MDS internal */
#define CEPH_LOCK_IPOLICY (1 << 5) /* policy lock on dirs. MDS internal */
#define CEPH_LOCK_IFILE (1 << 6)
#define CEPH_LOCK_INEST (1 << 7) /* mds internal */
#define CEPH_LOCK_IDFT (1 << 8)	 /* dir frag tree */
#define CEPH_LOCK_IAUTH (1 << 9)
#define CEPH_LOCK_ILINK (1 << 10)
#define CEPH_LOCK_IXATTR (1 << 11)
#define CEPH_LOCK_IFLOCK (1 << 12)	 /* advisory file locks */
#define CEPH_LOCK_IVERSION (1 << 13) /* mds internal */

#define CEPH_LOCK_IFIRST CEPH_LOCK_ISNAP

/* client_session ops */
enum
{
	CEPH_SESSION_REQUEST_OPEN,
	CEPH_SESSION_OPEN,
	CEPH_SESSION_REQUEST_CLOSE,
	CEPH_SESSION_CLOSE,
	CEPH_SESSION_REQUEST_RENEWCAPS,
	CEPH_SESSION_RENEWCAPS,
	CEPH_SESSION_STALE,
	CEPH_SESSION_RECALL_STATE,
	CEPH_SESSION_FLUSHMSG,
	CEPH_SESSION_FLUSHMSG_ACK,
	CEPH_SESSION_FORCE_RO,
	// A response to REQUEST_OPEN indicating that the client should
	// permanently desist from contacting the MDS
	CEPH_SESSION_REJECT,
	CEPH_SESSION_REQUEST_FLUSH_MDLOG
};

// flags for state reclaim
#define CEPH_RECLAIM_RESET 1

extern const char *ceph_session_op_name(int op);

struct ceph_mds_session_head
{
	__le32 op;
	__le64 seq;
	struct ceph_timespec stamp;
	__le32 max_caps, max_leases;
} __attribute__((packed));

/* client_request */
/*
 * metadata ops.
 *  & 0x001000 -> write op
 *  & 0x010000 -> follow symlink (e.g. stat(), not lstat()).
 &  & 0x100000 -> use weird ino/path trace
 */
#define CEPH_MDS_OP_WRITE 0x001000
enum
{
	CEPH_MDS_OP_LOOKUP = 0x00100,
	CEPH_MDS_OP_GETATTR = 0x00101,
	CEPH_MDS_OP_LOOKUPHASH = 0x00102,
	CEPH_MDS_OP_LOOKUPPARENT = 0x00103,
	CEPH_MDS_OP_LOOKUPINO = 0x00104,
	CEPH_MDS_OP_LOOKUPNAME = 0x00105,

	CEPH_MDS_OP_SETXATTR = 0x01105,
	CEPH_MDS_OP_RMXATTR = 0x01106,
	CEPH_MDS_OP_SETLAYOUT = 0x01107,
	CEPH_MDS_OP_SETATTR = 0x01108,
	CEPH_MDS_OP_SETFILELOCK = 0x01109,
	CEPH_MDS_OP_GETFILELOCK = 0x00110,
	CEPH_MDS_OP_SETDIRLAYOUT = 0x0110a,

	CEPH_MDS_OP_MKNOD = 0x01201,
	CEPH_MDS_OP_LINK = 0x01202,
	CEPH_MDS_OP_UNLINK = 0x01203,
	CEPH_MDS_OP_RENAME = 0x01204,
	CEPH_MDS_OP_MKDIR = 0x01220,
	CEPH_MDS_OP_RMDIR = 0x01221,
	CEPH_MDS_OP_SYMLINK = 0x01222,

	CEPH_MDS_OP_CREATE = 0x01301,
	CEPH_MDS_OP_OPEN = 0x00302,
	CEPH_MDS_OP_READDIR = 0x00305,

	CEPH_MDS_OP_LOOKUPSNAP = 0x00400,
	CEPH_MDS_OP_MKSNAP = 0x01400,
	CEPH_MDS_OP_RMSNAP = 0x01401,
	CEPH_MDS_OP_LSSNAP = 0x00402,
	CEPH_MDS_OP_RENAMESNAP = 0x01403,

	// internal op
	CEPH_MDS_OP_FRAGMENTDIR = 0x01500,
	CEPH_MDS_OP_EXPORTDIR = 0x01501,
	CEPH_MDS_OP_FLUSH = 0x01502,
	CEPH_MDS_OP_ENQUEUE_SCRUB = 0x01503,
	CEPH_MDS_OP_REPAIR_FRAGSTATS = 0x01504,
	CEPH_MDS_OP_REPAIR_INODESTATS = 0x01505,
	CEPH_MDS_OP_RDLOCK_FRAGSSTATS = 0x01507
};

extern const char *ceph_mds_op_name(int op);

#ifndef CEPH_SETATTR_MODE
#define CEPH_SETATTR_MODE (1 << 0)
#define CEPH_SETATTR_UID (1 << 1)
#define CEPH_SETATTR_GID (1 << 2)
#define CEPH_SETATTR_MTIME (1 << 3)
#define CEPH_SETATTR_ATIME (1 << 4)
#define CEPH_SETATTR_SIZE (1 << 5)
#define CEPH_SETATTR_CTIME (1 << 6)
#define CEPH_SETATTR_MTIME_NOW (1 << 7)
#define CEPH_SETATTR_ATIME_NOW (1 << 8)
#define CEPH_SETATTR_BTIME (1 << 9)
#endif
#define CEPH_SETATTR_KILL_SGUID (1 << 10)

/*
 * open request flags
 */
#define CEPH_O_RDONLY 00000000
#define CEPH_O_WRONLY 00000001
#define CEPH_O_RDWR 00000002
#define CEPH_O_CREAT 00000100
#define CEPH_O_EXCL 00000200
#define CEPH_O_TRUNC 00001000
#define CEPH_O_LAZY 00020000
#define CEPH_O_DIRECTORY 00200000
#define CEPH_O_NOFOLLOW 00400000

int ceph_flags_sys2wire(int flags);

/*
 * Ceph setxattr request flags.
 */
#define CEPH_XATTR_CREATE (1 << 0)
#define CEPH_XATTR_REPLACE (1 << 1)
#define CEPH_XATTR_REMOVE (1 << 31)

/*
 * readdir request flags;
 */
#define CEPH_READDIR_REPLY_BITFLAGS (1 << 0)

/*
 * readdir reply flags.
 */
#define CEPH_READDIR_FRAG_END (1 << 0)
#define CEPH_READDIR_FRAG_COMPLETE (1 << 8)
#define CEPH_READDIR_HASH_ORDER (1 << 9)
#define CEPH_READDIR_OFFSET_HASH (1 << 10)

/* Note that this is embedded wthin ceph_mds_request_head_legacy. */
union ceph_mds_request_args_legacy
{
	struct
	{
		__le32 mask; /* CEPH_CAP_* */
	} __attribute__((packed)) getattr;
	struct
	{
		__le32 mode;
		__le32 uid;
		__le32 gid;
		struct ceph_timespec mtime;
		struct ceph_timespec atime;
		__le64 size, old_size; /* old_size needed by truncate */
		__le32 mask;		   /* CEPH_SETATTR_* */
	} __attribute__((packed)) setattr;
	struct
	{
		__le32 frag;		/* which dir fragment */
		__le32 max_entries; /* how many dentries to grab */
		__le32 max_bytes;
		__le16 flags;
		__le32 offset_hash;
	} __attribute__((packed)) readdir;
	struct
	{
		__le32 mode;
		__le32 rdev;
	} __attribute__((packed)) mknod;
	struct
	{
		__le32 mode;
	} __attribute__((packed)) mkdir;
	struct
	{
		__le32 flags;
		__le32 mode;
		__le32 stripe_unit;	 /* layout for newly created file */
		__le32 stripe_count; /* ... */
		__le32 object_size;
		__le32 pool;	 /* if >= 0 and CREATEPOOLID feature */
		__le32 mask;	 /* CEPH_CAP_* */
		__le64 old_size; /* if O_TRUNC */
	} __attribute__((packed)) open;
	struct
	{
		__le32 flags;
		__le32 osdmap_epoch; /* use for set file/dir layout */
	} __attribute__((packed)) setxattr;
	struct
	{
		struct ceph_file_layout layout;
	} __attribute__((packed)) setlayout;
	struct
	{
		__u8 rule;	   /* currently fcntl or flock */
		__u8 type;	   /* shared, exclusive, remove*/
		__le64 owner;  /* who requests/holds the lock */
		__le64 pid;	   /* process id requesting the lock */
		__le64 start;  /* initial location to lock */
		__le64 length; /* num bytes to lock from start */
		__u8 wait;	   /* will caller wait for lock to become available? */
	} __attribute__((packed)) filelock_change;
} __attribute__((packed));

#define CEPH_MDS_FLAG_REPLAY 1		/* this is a replayed op */
#define CEPH_MDS_FLAG_WANT_DENTRY 2 /* want dentry in reply */
#define CEPH_MDS_FLAG_ASYNC 4		/* request is async */

struct ceph_mds_request_head_legacy
{
	__le64 oldest_client_tid;
	__le32 mdsmap_epoch;	 /* on client */
	__le32 flags;			 /* CEPH_MDS_FLAG_* */
	__u8 num_retry, num_fwd; /* count retry, fwd attempts */
	__le16 num_releases;	 /* # include cap/lease release records */
	__le32 op;				 /* mds op code */
	__le32 caller_uid, caller_gid;
	__le64 ino; /* use this ino for openc, mkdir, mknod,
					  etc. (if replaying) */
	union ceph_mds_request_args_legacy args;
} __attribute__((packed));

/*
 * Note that this is embedded wthin ceph_mds_request_head. Also, compatibility
 * with the ceph_mds_request_args_legacy must be maintained!
 */
union ceph_mds_request_args
{
	struct
	{
		__le32 mask; /* CEPH_CAP_* */
	} __attribute__((packed)) getattr;
	struct
	{
		__le32 mode;
		__le32 uid;
		__le32 gid;
		struct ceph_timespec mtime;
		struct ceph_timespec atime;
		__le64 size, old_size; /* old_size needed by truncate */
		__le32 mask;		   /* CEPH_SETATTR_* */
		struct ceph_timespec btime;
	} __attribute__((packed)) setattr;
	struct
	{
		__le32 frag;		/* which dir fragment */
		__le32 max_entries; /* how many dentries to grab */
		__le32 max_bytes;
		__le16 flags;
		__le32 offset_hash;
	} __attribute__((packed)) readdir;
	struct
	{
		__le32 mode;
		__le32 rdev;
	} __attribute__((packed)) mknod;
	struct
	{
		__le32 mode;
	} __attribute__((packed)) mkdir;
	struct
	{
		__le32 flags;
		__le32 mode;
		__le32 stripe_unit;	 /* layout for newly created file */
		__le32 stripe_count; /* ... */
		__le32 object_size;
		__le32 pool;	 /* if >= 0 and CREATEPOOLID feature */
		__le32 mask;	 /* CEPH_CAP_* */
		__le64 old_size; /* if O_TRUNC */
	} __attribute__((packed)) open;
	struct
	{
		__le32 flags;
		__le32 osdmap_epoch; /* use for set file/dir layout */
	} __attribute__((packed)) setxattr;
	struct
	{
		struct ceph_file_layout layout;
	} __attribute__((packed)) setlayout;
	struct
	{
		__u8 rule;	   /* currently fcntl or flock */
		__u8 type;	   /* shared, exclusive, remove*/
		__le64 owner;  /* who requests/holds the lock */
		__le64 pid;	   /* process id requesting the lock */
		__le64 start;  /* initial location to lock */
		__le64 length; /* num bytes to lock from start */
		__u8 wait;	   /* will caller wait for lock to become available? */
	} __attribute__((packed)) filelock_change;
	struct
	{
		__le32 mask; /* CEPH_CAP_* */
		__le64 snapid;
		__le64 parent;
		__le32 hash;
	} __attribute__((packed)) lookupino;
} __attribute__((packed));

#define CEPH_MDS_REQUEST_HEAD_VERSION 1

/*
 * Note that any change to this structure must ensure that it is compatible
 * with ceph_mds_request_head_legacy.
 */
struct ceph_mds_request_head
{
	__le16 version;
	__le64 oldest_client_tid;
	__le32 mdsmap_epoch;	 /* on client */
	__le32 flags;			 /* CEPH_MDS_FLAG_* */
	__u8 num_retry, num_fwd; /* count retry, fwd attempts */
	__le16 num_releases;	 /* # include cap/lease release records */
	__le32 op;				 /* mds op code */
	__le32 caller_uid, caller_gid;
	__le64 ino; /* use this ino for openc, mkdir, mknod,
					  etc. (if replaying) */
	union ceph_mds_request_args args;
} __attribute__((packed));

/* cap/lease release record */
struct ceph_mds_request_release
{
	__le64 ino, cap_id;	 /* ino and unique cap id */
	__le32 caps, wanted; /* new issued, wanted */
	__le32 seq, issue_seq, mseq;
	__le32 dname_seq; /* if releasing a dentry lease, a */
	__le32 dname_len; /* string follows. */
} __attribute__((packed));

static inline void
copy_from_legacy_head(struct ceph_mds_request_head *head,
					  struct ceph_mds_request_head_legacy *legacy)
{
	struct ceph_mds_request_head_legacy *embedded_legacy =
		(struct ceph_mds_request_head_legacy *)&head->oldest_client_tid;
	*embedded_legacy = *legacy;
}

static inline void
copy_to_legacy_head(struct ceph_mds_request_head_legacy *legacy,
					struct ceph_mds_request_head *head)
{
	struct ceph_mds_request_head_legacy *embedded_legacy =
		(struct ceph_mds_request_head_legacy *)&head->oldest_client_tid;
	*legacy = *embedded_legacy;
}

/* client reply */
struct ceph_mds_reply_head
{
	__le32 op;
	__le32 result;
	__le32 mdsmap_epoch;
	__u8 safe;				   /* true if committed to disk */
	__u8 is_dentry, is_target; /* true if dentry, target inode records
					  are included with reply */
} __attribute__((packed));

/* one for each node split */
struct ceph_frag_tree_split
{
	__le32 frag; /* this frag splits... */
	__le32 by;	 /* ...by this many bits */
} __attribute__((packed));

struct ceph_frag_tree_head
{
	__le32 nsplits; /* num ceph_frag_tree_split records */
	struct ceph_frag_tree_split splits[];
} __attribute__((packed));

/* capability issue, for bundling with mds reply */
struct ceph_mds_reply_cap
{
	__le32 caps, wanted; /* caps issued, wanted */
	__le64 cap_id;
	__le32 seq, mseq;
	__le64 realm; /* snap realm */
	__u8 flags;	  /* CEPH_CAP_FLAG_* */
} __attribute__((packed));

#define CEPH_CAP_FLAG_AUTH (1 << 0)	   /* cap is issued by auth mds */
#define CEPH_CAP_FLAG_RELEASE (1 << 1) /* ask client to release the cap */

/* reply_lease follows dname, and reply_inode */
struct ceph_mds_reply_lease
{
	__le16 mask;		/* lease type(s) */
	__le32 duration_ms; /* lease duration */
	__le32 seq;
} __attribute__((packed));

#define CEPH_LEASE_VALID (1 | 2)  /* old and new bit values */
#define CEPH_LEASE_PRIMARY_LINK 4 /* primary linkage */

struct ceph_mds_reply_dirfrag
{
	__le32 frag;  /* fragment */
	__le32 auth;  /* auth mds, if this is a delegation point */
	__le32 ndist; /* number of mds' this is replicated on */
	__le32 dist[];
} __attribute__((packed));

#define CEPH_LOCK_FCNTL 1
#define CEPH_LOCK_FLOCK 2
#define CEPH_LOCK_FCNTL_INTR 3
#define CEPH_LOCK_FLOCK_INTR 4

#define CEPH_LOCK_SHARED 1
#define CEPH_LOCK_EXCL 2
#define CEPH_LOCK_UNLOCK 4

struct ceph_filelock
{
	__le64 start;  /* file offset to start lock at */
	__le64 length; /* num bytes to lock; 0 for all following start */
	__le64 client; /* which client holds the lock */
	__le64 owner;  /* who requests/holds the lock */
	__le64 pid;	   /* process id holding the lock on the client */
	__u8 type;	   /* shared lock, exclusive lock, or unlock */
} __attribute__((packed));

/* file access modes */
#define CEPH_FILE_MODE_PIN 0
#define CEPH_FILE_MODE_RD 1
#define CEPH_FILE_MODE_WR 2
#define CEPH_FILE_MODE_RDWR 3 /* RD | WR */
#define CEPH_FILE_MODE_LAZY 4 /* lazy io */
#define CEPH_FILE_MODE_NUM 8  /* bc these are bit fields.. mostly */

int ceph_flags_to_mode(int flags);

/* inline data state */
#define CEPH_INLINE_NONE ((__u64)-1)
#define CEPH_INLINE_MAX_SIZE CEPH_MIN_STRIPE_UNIT

/* capability bits */
#define CEPH_CAP_PIN 1 /* no specific capabilities beyond the pin */

/* generic cap bits */
/* note: these definitions are duplicated in mds/locks.c */
#define CEPH_CAP_GSHARED 1	  /* client can reads */
#define CEPH_CAP_GEXCL 2	  /* client can read and update */
#define CEPH_CAP_GCACHE 4	  /* (file) client can cache reads */
#define CEPH_CAP_GRD 8		  /* (file) client can read */
#define CEPH_CAP_GWR 16		  /* (file) client can write */
#define CEPH_CAP_GBUFFER 32	  /* (file) client can buffer writes */
#define CEPH_CAP_GWREXTEND 64 /* (file) client can extend EOF */
#define CEPH_CAP_GLAZYIO 128  /* (file) client can perform lazy io */

#define CEPH_CAP_SIMPLE_BITS 2
#define CEPH_CAP_FILE_BITS 8

/* per-lock shift */
#define CEPH_CAP_SAUTH 2
#define CEPH_CAP_SLINK 4
#define CEPH_CAP_SXATTR 6
#define CEPH_CAP_SFILE 8

/* composed values */
#define CEPH_CAP_AUTH_SHARED (CEPH_CAP_GSHARED << CEPH_CAP_SAUTH)
#define CEPH_CAP_AUTH_EXCL (CEPH_CAP_GEXCL << CEPH_CAP_SAUTH)
#define CEPH_CAP_LINK_SHARED (CEPH_CAP_GSHARED << CEPH_CAP_SLINK)
#define CEPH_CAP_LINK_EXCL (CEPH_CAP_GEXCL << CEPH_CAP_SLINK)
#define CEPH_CAP_XATTR_SHARED (CEPH_CAP_GSHARED << CEPH_CAP_SXATTR)
#define CEPH_CAP_XATTR_EXCL (CEPH_CAP_GEXCL << CEPH_CAP_SXATTR)
#define CEPH_CAP_FILE(x) ((x) << CEPH_CAP_SFILE)
#define CEPH_CAP_FILE_SHARED (CEPH_CAP_GSHARED << CEPH_CAP_SFILE)
#define CEPH_CAP_FILE_EXCL (CEPH_CAP_GEXCL << CEPH_CAP_SFILE)
#define CEPH_CAP_FILE_CACHE (CEPH_CAP_GCACHE << CEPH_CAP_SFILE)
#define CEPH_CAP_FILE_RD (CEPH_CAP_GRD << CEPH_CAP_SFILE)
#define CEPH_CAP_FILE_WR (CEPH_CAP_GWR << CEPH_CAP_SFILE)
#define CEPH_CAP_FILE_BUFFER (CEPH_CAP_GBUFFER << CEPH_CAP_SFILE)
#define CEPH_CAP_FILE_WREXTEND (CEPH_CAP_GWREXTEND << CEPH_CAP_SFILE)
#define CEPH_CAP_FILE_LAZYIO (CEPH_CAP_GLAZYIO << CEPH_CAP_SFILE)

/* cap masks (for getattr) */
#define CEPH_STAT_CAP_INODE CEPH_CAP_PIN
#define CEPH_STAT_CAP_TYPE CEPH_CAP_PIN /* mode >> 12 */
#define CEPH_STAT_CAP_SYMLINK CEPH_CAP_PIN
#define CEPH_STAT_CAP_UID CEPH_CAP_AUTH_SHARED
#define CEPH_STAT_CAP_GID CEPH_CAP_AUTH_SHARED
#define CEPH_STAT_CAP_MODE CEPH_CAP_AUTH_SHARED
#define CEPH_STAT_CAP_NLINK CEPH_CAP_LINK_SHARED
#define CEPH_STAT_CAP_LAYOUT CEPH_CAP_FILE_SHARED
#define CEPH_STAT_CAP_MTIME CEPH_CAP_FILE_SHARED
#define CEPH_STAT_CAP_SIZE CEPH_CAP_FILE_SHARED
#define CEPH_STAT_CAP_ATIME CEPH_CAP_FILE_SHARED /* fixme */
#define CEPH_STAT_CAP_XATTR CEPH_CAP_XATTR_SHARED
#define CEPH_STAT_CAP_INODE_ALL (CEPH_CAP_PIN |         \
								 CEPH_CAP_AUTH_SHARED | \
								 CEPH_CAP_LINK_SHARED | \
								 CEPH_CAP_FILE_SHARED | \
								 CEPH_CAP_XATTR_SHARED)
#define CEPH_STAT_CAP_INLINE_DATA (CEPH_CAP_FILE_SHARED | \
								   CEPH_CAP_FILE_RD)
#define CEPH_STAT_RSTAT CEPH_CAP_FILE_WREXTEND

#define CEPH_CAP_ANY_SHARED (CEPH_CAP_AUTH_SHARED |  \
							 CEPH_CAP_LINK_SHARED |  \
							 CEPH_CAP_XATTR_SHARED | \
							 CEPH_CAP_FILE_SHARED)
#define CEPH_CAP_ANY_RD (CEPH_CAP_ANY_SHARED | CEPH_CAP_FILE_RD | \
						 CEPH_CAP_FILE_CACHE)

#define CEPH_CAP_ANY_EXCL (CEPH_CAP_AUTH_EXCL |  \
						   CEPH_CAP_LINK_EXCL |  \
						   CEPH_CAP_XATTR_EXCL | \
						   CEPH_CAP_FILE_EXCL)
#define CEPH_CAP_ANY_FILE_RD (CEPH_CAP_FILE_RD | CEPH_CAP_FILE_CACHE | \
							  CEPH_CAP_FILE_SHARED)
#define CEPH_CAP_ANY_FILE_WR (CEPH_CAP_FILE_WR | CEPH_CAP_FILE_BUFFER | \
							  CEPH_CAP_FILE_EXCL)
#define CEPH_CAP_ANY_WR (CEPH_CAP_ANY_EXCL | CEPH_CAP_ANY_FILE_WR)
#define CEPH_CAP_ANY (CEPH_CAP_ANY_RD | CEPH_CAP_ANY_EXCL |         \
					  CEPH_CAP_ANY_FILE_WR | CEPH_CAP_FILE_LAZYIO | \
					  CEPH_CAP_PIN)

#define CEPH_CAP_LOCKS (CEPH_LOCK_IFILE | CEPH_LOCK_IAUTH | CEPH_LOCK_ILINK | \
						CEPH_LOCK_IXATTR)

/* cap masks async dir operations */
#define CEPH_CAP_DIR_CREATE CEPH_CAP_FILE_CACHE
#define CEPH_CAP_DIR_UNLINK CEPH_CAP_FILE_RD
#define CEPH_CAP_ANY_DIR_OPS (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD | \
							  CEPH_CAP_FILE_WREXTEND | CEPH_CAP_FILE_LAZYIO)

int ceph_caps_for_mode(int mode);

enum
{
	CEPH_CAP_OP_GRANT,		   /* mds->client grant */
	CEPH_CAP_OP_REVOKE,		   /* mds->client revoke */
	CEPH_CAP_OP_TRUNC,		   /* mds->client trunc notify */
	CEPH_CAP_OP_EXPORT,		   /* mds has exported the cap */
	CEPH_CAP_OP_IMPORT,		   /* mds has imported the cap */
	CEPH_CAP_OP_UPDATE,		   /* client->mds update */
	CEPH_CAP_OP_DROP,		   /* client->mds drop cap bits */
	CEPH_CAP_OP_FLUSH,		   /* client->mds cap writeback */
	CEPH_CAP_OP_FLUSH_ACK,	   /* mds->client flushed */
	CEPH_CAP_OP_FLUSHSNAP,	   /* client->mds flush snapped metadata */
	CEPH_CAP_OP_FLUSHSNAP_ACK, /* mds->client flushed snapped metadata */
	CEPH_CAP_OP_RELEASE,	   /* client->mds release (clean) cap */
	CEPH_CAP_OP_RENEW,		   /* client->mds renewal request */
};

extern const char *ceph_cap_op_name(int op);

/* extra info for cap import/export */
struct ceph_mds_cap_peer
{
	__le64 cap_id;
	__le32 seq;
	__le32 mseq;
	__le32 mds;
	__u8 flags;
} __attribute__((packed));

/*
 * caps message, used for capability callbacks, acks, requests, etc.
 */
struct ceph_mds_caps_head
{
	__le32 op; /* CEPH_CAP_OP_* */
	__le64 ino, realm;
	__le64 cap_id;
	__le32 seq, issue_seq;
	__le32 caps, wanted, dirty; /* latest issued/wanted/dirty */
	__le32 migrate_seq;
	__le64 snap_follows;
	__le32 snap_trace_len;

	/* authlock */
	__le32 uid, gid, mode;

	/* linklock */
	__le32 nlink;

	/* xattrlock */
	__le32 xattr_len;
	__le64 xattr_version;
} __attribute__((packed));

struct ceph_mds_caps_non_export_body
{
	/* all except export */
	/* filelock */
	__le64 size, max_size, truncate_size;
	__le32 truncate_seq;
	struct ceph_timespec mtime, atime, ctime;
	struct ceph_file_layout layout;
	__le32 time_warp_seq;
} __attribute__((packed));

struct ceph_mds_caps_export_body
{
	/* export message */
	struct ceph_mds_cap_peer peer;
} __attribute__((packed));

/* cap release msg head */
struct ceph_mds_cap_release
{
	__le32 num; /* number of cap_items that follow */
} __attribute__((packed));

struct ceph_mds_cap_item
{
	__le64 ino;
	__le64 cap_id;
	__le32 migrate_seq, seq;
} __attribute__((packed));

#define CEPH_MDS_LEASE_REVOKE 1		/*    mds  -> client */
#define CEPH_MDS_LEASE_RELEASE 2	/* client  -> mds    */
#define CEPH_MDS_LEASE_RENEW 3		/* client <-> mds    */
#define CEPH_MDS_LEASE_REVOKE_ACK 4 /* client  -> mds    */

extern const char *ceph_lease_op_name(int o);

/* lease msg header */
struct ceph_mds_lease
{
	__u8 action; /* CEPH_MDS_LEASE_* */
	__le16 mask; /* which lease */
	__le64 ino;
	__le64 first, last; /* snap range */
	__le32 seq;
	__le32 duration_ms; /* duration of renewal */
} __attribute__((packed));
/* followed by a __le32+string for dname */

/* client reconnect */
struct ceph_mds_cap_reconnect
{
	__le64 cap_id;
	__le32 wanted;
	__le32 issued;
	__le64 snaprealm;
	__le64 pathbase;  /* base ino for our path to this ino */
	__le32 flock_len; /* size of flock state blob, if any */
} __attribute__((packed));
/* followed by flock blob */

struct ceph_mds_cap_reconnect_v1
{
	__le64 cap_id;
	__le32 wanted;
	__le32 issued;
	__le64 size;
	struct ceph_timespec mtime, atime;
	__le64 snaprealm;
	__le64 pathbase; /* base ino for our path to this ino */
} __attribute__((packed));

struct ceph_mds_snaprealm_reconnect
{
	__le64 ino;	   /* snap realm base */
	__le64 seq;	   /* snap seq for this snap realm */
	__le64 parent; /* parent realm */
} __attribute__((packed));

/*
 * snaps
 */
enum
{
	CEPH_SNAP_OP_UPDATE, /* CREATE or DESTROY */
	CEPH_SNAP_OP_CREATE,
	CEPH_SNAP_OP_DESTROY,
	CEPH_SNAP_OP_SPLIT,
};

extern const char *ceph_snap_op_name(int o);

/* snap msg header */
struct ceph_mds_snap_head
{
	__le32 op;				 /* CEPH_SNAP_OP_* */
	__le64 split;			 /* ino to split off, if any */
	__le32 num_split_inos;	 /* # inos belonging to new child realm */
	__le32 num_split_realms; /* # child realms udner new child realm */
	__le32 trace_len;		 /* size of snap trace blob */
} __attribute__((packed));
/* followed by split ino list, then split realms, then the trace blob */

/*
 * encode info about a snaprealm, as viewed by a client
 */
struct ceph_mds_snap_realm
{
	__le64 ino;			 /* ino */
	__le64 created;		 /* snap: when created */
	__le64 parent;		 /* ino: parent realm */
	__le64 parent_since; /* snap: same parent since */
	__le64 seq;			 /* snap: version */
	__le32 num_snaps;
	__le32 num_prior_parent_snaps;
} __attribute__((packed));
/* followed by my snap list, then prior parent snap list */

#ifndef __KERNEL__
#undef __le16
#undef __le32
#undef __le64
#endif

#endif
